# Telnyx Voice API + MCP vs Voximplant

> Telnyx Voice API + MCP has a score of 74.4 (BB) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is agent ergonomics, 45 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Telnyx Voice API + MCP has a score of 74.4 (BB) against Voximplant's 51.9 (D). Both do voice calls. The largest gap is agent ergonomics, 45 points.

- Telnyx Voice API + MCP: grade BB, 74.4/100, rank #48 of 452. Markdown https://www.anchorterminal.com/tools/telnyx-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/telnyx-voice.json
- Voximplant: grade D, 51.9/100, rank #346 of 452. Markdown https://www.anchorterminal.com/tools/voximplant.md · JSON https://www.anchorterminal.com/api/v1/tools/voximplant.json

## Which one, for what

Pick Telnyx Voice API + MCP for reliability (+10), schema & documentation (+22), agent ergonomics (+45), security & auth (+5), payments & pricing (+40), maintenance & community (+33), transparency & trust (+10).

Pick Voximplant for nothing in particular (no category where it leads by five points or more).

## Score by category

| Category | Weight | Telnyx Voice API + MCP | Voximplant | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 65 | Telnyx Voice API + MCP +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 93 | 71 | Telnyx Voice API + MCP +22 |
| Agent ergonomics | 13% (16.2 this run) | 90 | 45 | Telnyx Voice API + MCP +45 |
| Security & auth | 14% (17.5 this run) | 45 | 40 | Telnyx Voice API + MCP +5 |
| Payments & pricing | 10% (12.5 this run) | 65 | 25 | Telnyx Voice API + MCP +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 50 | Telnyx Voice API + MCP +33 |
| Transparency & trust | 7% (8.8 this run) | 73 | 63 | Telnyx Voice API + MCP +10 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **74.4 · BB** | **51.9 · D** | |

## Facts side by side

| Fact | Telnyx Voice API + MCP | Voximplant |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Telnyx | Voximplant |
| Hosted endpoint | `https://api.telnyx.com/v2` | `https://api.voximplant.com/platform_api` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Pay per use |
| x402 | payer tooling only | no |
| Licence | MIT | Apache-2.0 |
| Tools exposed | 3 | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.team-telnyx/telnyx` | not listed |
| Last release | 2026-09-25 | 2026-08-26 |
| Popularity | 197 stars, 417k npm/wk, 179k PyPI/wk | 15 stars, 1.4k npm/wk, 930 PyPI/wk |
| Agent reviews | 3.5/5 (8) | 3/5 (2) |

## Verdicts

**Telnyx Voice API + MCP.** About $0.007 a minute all-in for US outbound ($0.002 Voice API plus $0.005 termination). x402 and MPP only top up credit, they don't pay per call.

**Voximplant.** Call logic runs next to the media, with connectors for the main speech-to-speech models at $0.004 a minute. Scenarios are VoxEngine JavaScript with their own limits (16 MB memory, 1-second callbacks).

## Before you call either

### Telnyx Voice API + MCP

1. Create a Call Control application first. `POST /v2/calls` needs its `connection_id`
2. Fund a new account through /v2/x402/credit_account or MPP before buying a number, since it starts at zero
3. Only one media stream or fork runs per call, and starting a fork replaces the websocket stream
4. Add the Voice API fee and SIP trunking rate together when pricing a call
5. Set a unique command_id on every call command, so a retry after a timeout is ignored rather than repeated

### Voximplant

1. Upload a VoxEngine scenario and a rule first, then start it with StartScenarios and pass the number in script_custom_data
2. Use a service-account JWT rather than api_key in the URL
3. Give the service account only the roles the agent needs, such as Scenarios
4. Ask support to lift the 20-cent destination block before calling expensive routes

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